To make a torch you would need coal/charcoal and a stick, combine it in a crafting table and you get 4 torches.

How do you modify the amount of items that a crafting recipe outputs?

Do you mean for a recipe that you added or a recipe from Vanilla Minecraft?

 

If you mean your own recipe, just change the constructor you use for the result ItemStack to new ItemStack(YourItem, qty) where qty is the number of items to output.

 

If you want to modify a recipe from Vanilla, then don't. It is generally a bad idea to mess with Vanilla, you might break compatibility with other mods.

Thanks!

I was modifying my own recipe, I just used the torch as an example.